Avalanche Forecast

Issued: Feb 20th, 2015 7:29AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada esharp, Avalanche Canada

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Summary

Confidence

Good - The weather pattern is stable

Weather Forecast

A cold front slowly moving in from the northeast will being continued light perception through Saturday with higher accumulations (up to 10cm of snow) expected on the eastern slope.  Sunny and dry conditions are expected for  Sunday and Monday.  Winds will be predominately light from the northeast to northwest through the period.   A slight cooling trend is expected with the passage of the front and freezing levels will hover around valley bottom over the weekend before climbing back up to 2000m on Monday.

Avalanche Summary

No new avalanches have been reported recently

Snowpack Summary

A thick, solid crust can be found at the surface on all but highest alpine slopes. It sounds like the best riding is in the North of the region where the curst does not extend as high and a thin dusting covers old wind pressed snow in alpine. The recent winds have been light to moderate from the southwest and I suspect that you can find isolated thin windslabs in lee features. Below 2100 to 2400m the crust is effectively capping the snowpack and protecting a couple of buried persistent week layers. The mid-January surface hoar is around 60 to 80cm down. The mid-December crust is becoming harder to find but where it does exist (mainly at treeline elevations) it is over a meter down. At upper elevations where these layers are note protected by the crust it could still be possible to trigger an avalanche form a thin or rocky spot.

Problems

Wind Slabs

An icon showing Wind Slabs
New snow may hide old wind slabs lurking below ridge crests and in exposed gullies. These isolated pockets of stiff snow can fracture surprising distances above you and into low-angled terrain catching people by surprise.
Be cautious as you transition into wind affected terrain.>Look out for areas that may have been reverse loaded by northerly winds.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 4

Persistent Slabs

An icon showing Persistent Slabs
 Large avalanches are unlikely in most places but are possible in the high alpine where a large trigger in the right spot could cause an avalanche on a buried persistent week layer.
Be aware of the potential for very large, deep avalanches due to the presence of buried surface hoar or a facet/crust layer.>Be alert to conditions that change with elevation, the surface crust that is protecting deeper weak layers tapers out in the high alpine.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

2 - 5

Valid until: Feb 21st, 2015 2:00PM

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